Product Brief BCM5912X Octal Power Sourcing Equipment Controller Overview The Broadcom BCM5912X is a highly integrated IEEE 802.3bt-compliant power sourcing equipment (PSE) controller family with unsurpassed integration and flexibility. The devices contain eight low-RDS (0.2), high-voltage FETs, each with a very accurate, lossless, proprietary internal current sense and an onboard microcontroller, all targeted to significantly reduce the complexity of Power over Ethernet (PoE), Power over Ethernet Plus (PoE+), and UPoE designs while easing PCB layout. The BCM5912X family provides excellent protection under all possible fault conditions and overloads. It also supports two-event Classification for Type 2 (30W) applications and multi-event Classification for 802.3bt Standard Type 3/ Type 4 applications. The BCM5912X family of controllers has a networking-oriented host Key Features interface, communicating by using a BSC bus, and capable of speeds up to IEEE 802.3bt-compliant with 2.4 Mb/s. support for IEEE 802.3at and IEEE 802.3af Benefits Supports Type 2, Type 3, and Type 4 multi-event classification (Type 4 Cascading of multiple devices up to 64 ports supported only supported by BCM59122) Integrated Field Effect Transistor (FETs) eliminates the need for external Supports four-pair 60W bt FETs Type 3 and 90W bt Type 4 Integrated current-sense mechanism eliminates the need for external applications (Type 4 only supported sense resistor and fuse by BCM59122) Integrated MCU for firmware download, custom features, and bug fixes Supports detection of legacy power devices (PDs) Underwriters Laboratory (UL) certified Cascading of multiple devices up to 64 ports supported Applications Programmable I and I for Routers CUT LIM Type 1, Type 2, Type 3, and Type Enterprise switches 4 (Type 4 only supported by Security camera switch hub BCM59122) Broadcom Serial Control (BSC), an POE lighting 2 I C-compatible bus architecture Manual and semiautonomous operating mode Real-time current, voltage, and temperature measurements available per port Overtemperature protection (warning and shutdown) Octal Power Sourcing Equipment ControllerProduct Brief BCM5912X Block Diagram (One of eig ht ports shown) Key Features (cont) TX 48V BCM5912X Operates from a 48V supply (nominal) and external 3.3V supply 10-bit ADC Firmware download capability RAM + through BSC communication bus VDD ROM Microcontroller from host RX 3.3V Comm (BSC) 8 mm 8 mm 0.9 mm QFN- 56 package (0.5-mm pitch) with PSE VDDA exposed pad Pass-FET Control Curren t Sense SDATAIN, SDATAOUT, SCLKIN, SCLKOUT To Host OPTOS Ordering Information Part Number Package Ambient Temperature BCM59121B0KMLG 56-pin, 8 mm 8 mm, QFN56 (Pb-free) 40C to +85C BCM59122B0KMLG 56-pin, 8 mm 8 mm, QFN56 (Pb-free) 40C to +55C For more product information: broadcom.com Copyright 2018 Broadcom. All Rights Reserved. Broadcom, the pulse logo, and Connecting everything are among the trademarks of Broadcom. The term Broadcom refers to Broadcom Inc. and/or its subsidiaries. 5912X-PB100 October 5, 2018